Just because government employees have to follow all laws according to rule 4.1 doesn't mean the law can't be enforced on them and it's only a staff issue. Corporals/supervisors will still enforce the law on government employees.
Like
@rogue said, it is basically a failsafe at the moment, even if this isn't intentional, as we are still in character whilst roleplaying. Imagine someone exploiting this when there are no staff members on or staff are extremely busy, police would not be able to do anything about it whatsoever and will literally just have to allow whatever is going on, no matter how extreme the actions may be, as long as the actions don't fall under other offences.
The law is fine. I see no logical reason to remove it. Yes, it won't be enforced much due to the updated server rule, but it should still exist. It would be illogical to remove supervisor powers to detain and charge other officers because 'rule 4.1 says they
must follow the law'. The situation should ideally continue in character, unless extremely serious, and you should then inform a staff member when practicable.